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Old 08-26-2014, 01:10 PM   #15
Country Coach Owners Club
Join Date: May 2014
Posts: 91
Originally Posted by Smitty77 View Post
OP - Thanks for coming back and closing the loop on what you found out. This helps others when the do searches for similar problems.

Absolutely. I figured it might help some other poor soul pulling their hair out.
To everyone, thanks for the suggestions however I won't be drilling or plugging. Now that the tanks are all calibrated properly I won't be overfilling them again.

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Old 08-26-2014, 07:50 PM   #16
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Join Date: Feb 2010
Posts: 4,278
Regarding the hole...

Next time in town visit any auto supply and pick up a vacuum check valve.

Cars are full of them for smog stuff and you have many styles to choose from.

Find one with barb fittings slightly larger than hose.

Then punch it into the hole so air can go in but water not out.

If good fit it will not need sealer...think drip irrigation interface...just punches in and the barb keeps it in place.

Tony & Lori
1989 Country Coach Savannah SE
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Old 02-11-2015, 12:28 PM   #17
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Join Date: Feb 2015
Posts: 2
How to stop the overflow siphon from draining the water tank

After the evil siphon starts, open tank main drain valve to force the tank to drain out the main drain hose instead of the overflow hose, then wait for the "Glug Glug" sound (about 30 seconds) then close the main drain valve. The draining force of the main drain valve will overpower the drain force of the overflow hose (the one that will start a siphon and drain most of your water tank unless you take these steps to stop it). This causes the overflow hose to flow in the reverse direction, which means start sucking air and stop dribbling water, which effectively breaks the siphon. Now you can close your main tank drain valve. You will have only lost 1 or 1.5 gallons - not enough to worry about. Your tank will still be so full that a little water may splash out on the highway with road bumps.

I would consider this an undocumented or poorly-documented procedure rather than a design defect.

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fresh water, tank, water

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